Question

The momentum of object changes from 5kgm/s to 10kg m/s in 5s. Find the force. ​

Answer 1

Provided that:

• Initial momentum = 5 kg m/s
• Final momentum = 10 kg m/s
• Time taken = 5 seconds

To calculate:

• The force

Solution:

• The force = 1 Newton

Using concept:

• Rate of change in momentum formula.

Using formula:

• (Final momentum - Initial momentum)/Time taken

Knowledge required: The rate of change in momentum is directly proportional to force.

Required solution:

➝ Rate of change in momentum = (Final momentum - Initial momentum)/Time taken

➝ Rate of change in momentum = (10-5)/5

➝ Rate of change in momentum = 5/5

➝ Rate of change in momentum = 1 kilogram metre per second

➝ Force = 1 Newton